Creating multiple sites

I have one site and 3 blogs created for me by designers. I\'d like to try creating a few more on my own, but don\'t want to screw up what I currently have. I also don\'t want to make mistakes that let hackers into my new sites. I\'m signed into my wordpress.com account. How do I now start creating new sites to be hosted with my own domain names on a godaddy server?

Contact godaddy and post to http://wordpress.ORG/support/ If you have not registered a WordPress.org username account yet you can do so on the top right hand corner of the page I just linked to so you can post to those support forums.
Best wishes with your site.